[ruby-core:123582] [Ruby Bug#21655] segfault when building 3.3.10, regression from 3.3.9
Issue #21655 has been reported by kurly (Greg Kubaryk). ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by kurly (Greg Kubaryk). backtrace using a gentoo-built build with -ggdb3 added to CFLAGS ``` beans ~ # cd /var/tmp/portage/dev-lang/ruby-3.3.10/work/ruby-3.3.10/ beans /var/tmp/portage/dev-lang/ruby-3.3.10/work/ruby-3.3.10 # gdb --args ./miniruby -I./lib -I. -I.ext/common -n -e 'BEGIN{version=ARGV.shift;mis=ARGV.dup}' -e 'END{abort "UNICODE version mismatch: #{mis}" unless mis.empty?}' -e '(mis.delete(ARGF.path); ARGF.close) if /ONIG_UNICODE_VERSION_STRING +"#{Regexp.quote(version)}"/o' 15.0.0 ./enc/unicode/15.0.0/casefold.h ./enc/unicode/15.0.0/name2ctype.h ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc ./template/builtin_binary.inc.tmpl GNU gdb (Gentoo 16.3 vanilla) 16.3 Copyright (C) 2024 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-pc-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://bugs.gentoo.org/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./miniruby... warning: File "/var/tmp/portage/dev-lang/ruby-3.3.10/work/ruby-3.3.10/.gdbinit" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load". To enable execution of this file add add-auto-load-safe-path /var/tmp/portage/dev-lang/ruby-3.3.10/work/ruby-3.3.10/.gdbinit line to your configuration file "/root/.config/gdb/gdbinit". To completely disable this security protection add set auto-load safe-path / line to your configuration file "/root/.config/gdb/gdbinit". For more information about this security protection see the "Auto-loading safe path" section in the GDB manual. E.g., run from the shell: info "(gdb)Auto-loading safe path" (gdb) run Starting program: /var/tmp/portage/dev-lang/ruby-3.3.10/work/ruby-3.3.10/miniruby -I./lib -I. -I.ext/common -n -e BEGIN\{version=ARGV.shift\;mis=ARGV.dup\} -e END\{abort\ \"UNICODE\ version\ mismatch:\ \#\{mis\}\"\ unless\ mis.empty\?\} -e \(mis.delete\(ARGF.path\)\;\ ARGF.close\)\ if\ /ONIG_UNICODE_VERSION_STRING\ +\"\#\{Regexp.quote\(version\)\}\"/o 15.0.0 ./enc/unicode/15.0.0/casefold.h ./enc/unicode/15.0.0/name2ctype.h ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc ./template/builtin_binary.inc.tmpl [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00007ffff7c76d69 in malloc_usable_size () from /lib64/libc.so.6 (gdb) bt #0 0x00007ffff7c76d69 in malloc_usable_size () from /lib64/libc.so.6 #1 0x000055555563b490 in objspace_malloc_size (objspace=0x5555559a7550, ptr=0x45005555559e6dc0, hint=<optimized out>) at gc.c:12381 #2 objspace_xrealloc (objspace=0x5555559a7550, ptr=0x45005555559e6dc0, new_size=18, old_size=<optimized out>) at gc.c:12689 #3 0x0000555555760a8a in rb_str_resize (str=str@entry=140737348585000, len=17) at string.c:3179 #4 0x0000555555760c2d in rb_fstring (str=str@entry=140737348585000) at ./include/ruby/internal/core/rstring.h:369 #5 0x00005555557a32c8 in build_const_pathname (head=<optimized out>, tail=140737348585040) at variable.c:397 #6 rb_set_class_path_string (klass=klass@entry=140737348547760, under=under@entry=140737348551920, name=140737348585040) at variable.c:417 #7 0x000055555559c2f4 in rb_define_class_id_under_no_pin (outer=140737348551920, id=10891, super=140737348552240, super@entry=93824992527378) at class.c:1035 #8 0x000055555559c412 in rb_define_class_id_under (outer=<optimized out>, id=<optimized out>, super=super@entry=93824992527378) at class.c:1045 #9 0x000055555559c470 in rb_define_class_under (outer=<optimized out>, name=name@entry=0x555555846fdc "EADDRINUSE", super=93824992527378) at class.c:1006 #10 0x000055555560e153 in set_syserr (n=n@entry=98, name=name@entry=0x555555846fdc "EADDRINUSE") at error.c:2711 #11 0x00005555556148e9 in Init_syserr () at /var/tmp/portage/dev-lang/ruby-3.3.10/work/ruby-3.3.10/known_errors.inc:18 #12 0x0000555555647eaa in rb_call_inits () at inits.c:40 #13 0x0000555555618943 in ruby_setup () at eval.c:89 #14 0x000055555561a40d in ruby_init () at eval.c:101 #15 0x0000555555576193 in rb_main (argc=22, argv=0x7fffffffe098) at ./main.c:38 #16 main (argc=<optimized out>, argv=<optimized out>) at ./main.c:64 (gdb) frame 3 #3 0x0000555555760a8a in rb_str_resize (str=str@entry=140737348585000, len=17) at string.c:3179 3179 SIZED_REALLOC_N(RSTRING(str)->as.heap.ptr, char, (gdb) p str $1 = 140737348585000 (gdb) p *str $2 = 8396805 (gdb) ``` ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114964 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by kurly (Greg Kubaryk). Thank you for fixing the markdown in the comment 0. On an affected machine, I was able to bisect the git repo between tags v3_3_9 and v3_3_10: ``` 5a8d7642168f4ea0d9331fded3033c225bbc36c5 is the first bad commit commit 5a8d7642168f4ea0d9331fded3033c225bbc36c5 (HEAD) Author: nagachika <nagachika@ruby-lang.org> AuthorDate: Wed Oct 8 22:55:33 2025 +0900 Commit: nagachika <nagachika@ruby-lang.org> CommitDate: Wed Oct 8 22:56:02 2025 +0900 merge revision(s) 43dbb9a93f4de3f1170d7d18641c30e81cc08365, 2bb6fe3854e2a4854bb89bfce4eaaea9d848fd1b, 7c9dd0ecff61153b96473c6c51d5582e809da489: [Backport #21629] [PATCH] [Bug #21629] Enable `nonstring` attribute on clang 21 [PATCH] [Bug #21629] Initialize `struct RString` [PATCH] [Bug #21629] Initialize `struct RArray` error.c | 2 +- ext/-test-/string/fstring.c | 2 +- include/ruby/internal/attr/nonstring.h | 8 ++++++++ include/ruby/internal/core/rbasic.h | 3 +++ include/ruby/internal/core/rstring.h | 2 +- load.c | 4 ++-- marshal.c | 2 +- string.c | 8 ++++---- symbol.c | 8 ++++---- version.h | 2 +- 10 files changed, 26 insertions(+), 15 deletions(-) ``` I was not able to reproduce the build failure for ruby 3.3.10 on an Ubuntu 24.04 machine using gcc-13.3.0. ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114966 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by kurly (Greg Kubaryk). I manually bisected inside that "bad" commit and found that this minimal diff on top of v3_3_10 eliminates the build failure: ``` diff --git a/include/ruby/internal/core/rstring.h b/include/ruby/internal/core/rstring.h index 9cf9daa97c..0bca74e688 100644 --- a/include/ruby/internal/core/rstring.h +++ b/include/ruby/internal/core/rstring.h @@ -395,7 +395,7 @@ rbimpl_rstring_getmem(VALUE str) } else { /* Expecting compilers to optimize this on-stack struct away. */ - struct RString retval = {RBASIC_INIT}; + struct RString retval; retval.len = RSTRING_LEN(str); retval.as.heap.ptr = RSTRING(str)->as.embed.ary; return retval; ``` ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114967 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by alanwu (Alan Wu). It's surprising that leaving the temporary struct uninitialized avoids the crash. Smells like a GCC bug or some UB on our end the optimizer is exploiting. Does building with `-fno-strict-aliasing` help? ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114986 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by kurly (Greg Kubaryk). alanwu (Alan Wu) wrote in #note-5:
It's surprising that leaving the temporary struct uninitialized avoids the crash. Smells like a GCC bug or some UB on our end the optimizer is exploiting.
Does `./configure optflags=-fno-strict-aliasing ...` help?
It doesn't appear to, when added to CFLAGS nor optflags. ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114987 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by kurly (Greg Kubaryk). alanwu (Alan Wu) wrote in #note-5:
It's surprising that leaving the temporary struct uninitialized avoids the crash. Smells like a GCC bug or some UB on our end the optimizer is exploiting.
Does `./configure optflags=-fno-strict-aliasing ...` help?
Per a suggestion on the downstream bug, I tried adding `-fno-ipa-modref` to CFLAGS, and that *was* sufficient to fix the build. ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114988 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by alanwu (Alan Wu). Looks like you're not building with LTO, so the miscomp from `ipa-modref` should be in rb_str_resize(). That should be enough for a bug report for GCC, since they [need](https://gcc.gnu.org/bugs/#need) a preprocessed C file. Maybe this is hitting the same GCC bug as this: <https://patchwork.sourceware.org/project/gdb/patch/20250712131649.8372-1-tdevries@suse.de/#206552> which `-fno-ipa-modref` also fixes. Unfortunately the bug on GCC side is still unresolved: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120987> ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114989 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by thesamesam (Sam James). alanwu (Alan Wu) wrote in #note-8:
Looks like you're not building with LTO, so the miscomp from `ipa-modref` should be in rb_str_resize(). That should be enough for a bug report for GCC, since they [need](https://gcc.gnu.org/bugs/#need) a preprocessed C file.
Maybe this is hitting the same GCC bug as this: <https://patchwork.sourceware.org/project/gdb/patch/20250712131649.8372-1-tdevries@suse.de/#206552> which `-fno-ipa-modref` also fixes. Unfortunately the bug on GCC side is still unresolved: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120987>
That bug has a patch which should workaround (or fix, it's not clear) that specific issue, but I asked OP to test that and it didn't help the issue. But it may (or may not) still be an issue in modref, just probably not _that_ bug. ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114992 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by thesamesam (Sam James). Reminds me a bit of https://bugs.ruby-lang.org/issues/21516 as well. ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-114994 * Author: kurly (Greg Kubaryk) * Status: Open * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by alanwu (Alan Wu). Status changed from Open to Third Party's Issue Thanks, I was able to repro this locally. I confirmed that it's a miscompilation, ran reduction and sent a GCC bug report https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122610 The following workaround fixes the build for me: ```patch diff --git a/include/ruby/internal/core/rstring.h b/patched-rstring.h index 9cf9daa..d76ba9c 100644 --- a/include/ruby/internal/core/rstring.h +++ b/patched-rstring.h @@ -415,7 +415,9 @@ RBIMPL_ATTR_ARTIFICIAL() static inline char * RSTRING_PTR(VALUE str) { - char *ptr = rbimpl_rstring_getmem(str).as.heap.ptr; + char *ptr = RB_FL_TEST_RAW(str, RSTRING_NOEMBED) ? + RSTRING(str)->as.heap.ptr : + RSTRING(str)->as.embed.ary; if (RUBY_DEBUG && RB_UNLIKELY(! ptr)) { /* :BEWARE: @shyouhei thinks that currently, there are rooms for this ``` It fixes this particular instance, but with an optimizer bug in play, who knows where else we're hitting it. To dodge the bug, maybe all usages of rbimpl_rstring_getmem() need to be rewritten. I'll defer to @nagachia whether we want to apply a workaround for ruby_3_3. This shows up as a miscompilation of str_buf_cat4(), particularly this part: ```c RESIZE_CAPA_TERM(str, capa, termlen); sptr = RSTRING_PTR(str); ``` GCC deletes the RSTRING_PTR() reload in case the string grows and turns from embedded to heap. The memcpy afterwards using the stale sptr then stomps on the newly allocated pointer. ---------------------------------------- Bug #21655: segfault when building 3.3.10, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115123 * Author: kurly (Greg Kubaryk) * Status: Third Party's Issue * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by nagachika (Tomoyuki Chikanaga). Backport changed from 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN to 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED Thanks @kurly and @alanwu. I understand the situation now. I'm ready to apply a workarounds for ruby_3_3. The implementation of rbimpl_rstring_getmem() is the same on master and ruby_3_4. The issue with GCC 15.2.1 likely exist on these branches as well. I prefer to apply the workaround on master first and backport it to the stable branches. Do you know the issue was reproducible on ruby-3.4.7 or master branch? ---------------------------------------- Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115130 * Author: kurly (Greg Kubaryk) * Status: Third Party's Issue * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by kurly (Greg Kubaryk). nagachika (Tomoyuki Chikanaga) wrote in #note-14:
Do you know the issue was reproducible on ruby-3.4.7 or master branch?
Yes, the issue can be reproduced at master branch (`529dd8d76efbe655fabce8933852504851266b2b`) and ruby_3_4 tag (`9e426489f00a1b7816e8c6f299daa6116c5f505d`) both. ---------------------------------------- Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115131 * Author: kurly (Greg Kubaryk) * Status: Third Party's Issue * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by alanwu (Alan Wu). A build of the master branch with options from OP crashes the same way as ruby_3_3 for me... I'll commit something later. Because inter-procedural analysis is key to triggering the miscompilation, changes to seemingly unrelated places can dodge it. Finding the best place to change will be easier after we learn how the GCC folks fix it. Making code changes to dodge this while ipa-modref is active seems like playing with fire, though. The GCC issue exists from version 12 through 15.2.1 and on a [recent trunk build](https://godbolt.org/z/bPezbYqY5). Maybe we need to resort to adding a check for this in `configure.ac` because even after a GCC fix not everyone will update. ---------------------------------------- Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115132 * Author: kurly (Greg Kubaryk) * Status: Third Party's Issue * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by nagachika (Tomoyuki Chikanaga). Just FYI: I have filed a pull request based on alan's patch. https://github.com/ruby/ruby/pull/15113 IMO, rbimpl_rstring_getmem() is a little tricky, so I feel it's reasonable to remove it. However, it's possible that I'm unaware of a reason why this function is necessary, such as for some optimization purposes... ---------------------------------------- Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115135 * Author: kurly (Greg Kubaryk) * Status: Third Party's Issue * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by nagachika (Tomoyuki Chikanaga). Status changed from Third Party's Issue to Closed https://github.com/ruby/ruby/pull/15113 has been merged. ---------------------------------------- Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115158 * Author: kurly (Greg Kubaryk) * Status: Closed * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by nagachika (Tomoyuki Chikanaga). Backport changed from 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED to 3.2: UNKNOWN, 3.3: DONE, 3.4: REQUIRED ruby_3_3 commit:61a9c450f45b318d43de987e80b9b1dcd5b4d007 merged revision(s) commit:9d44cb0b2b5520b2b299851003ca2a97bf1e2079, commit:367ddd445cdf5ccc55a0481c944746ef595f72f7, commit:48dce7874fcb571765635b32fa6a3e3a12e228f8. ---------------------------------------- Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115351 * Author: kurly (Greg Kubaryk) * Status: Closed * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: DONE, 3.4: REQUIRED ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
Issue #21655 has been updated by k0kubun (Takashi Kokubun). Backport changed from 3.2: UNKNOWN, 3.3: DONE, 3.4: REQUIRED to 3.2: UNKNOWN, 3.3: DONE, 3.4: DONE ruby_3_4 commit:da66b64a18414d5ece52512eb016c1af2ede1730 merged revision(s) commit:9d44cb0b2b5520b2b299851003ca2a97bf1e2079, commit:367ddd445cdf5ccc55a0481c944746ef595f72f7, commit:48dce7874fcb571765635b32fa6a3e3a12e228f8. ---------------------------------------- Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9 https://bugs.ruby-lang.org/issues/21655#change-115499 * Author: kurly (Greg Kubaryk) * Status: Closed * ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux] * Backport: 3.2: UNKNOWN, 3.3: DONE, 3.4: DONE ---------------------------------------- ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually build log excerpt; the rest will be provided as an attachment ``` gcc -O2 -pipe -march=amdfam10 -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/serialize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread -o miniruby : ./miniruby -I./lib -I. -I.ext/common ./tool/generic_erb.rb -o builtin_binary.inc \ ./template/builtin_binary.inc.tmpl make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped) ``` ---Files-------------------------------- buildlog (76.5 KB) -- https://bugs.ruby-lang.org/
participants (5)
-
alanwu (Alan Wu) -
k0kubun (Takashi Kokubun)
-
kurly (Greg Kubaryk)
-
nagachika (Tomoyuki Chikanaga)
-
thesamesam (Sam James)